body {
  margin: 0;
}

.clear-margin {
  &::before {
    content: '1';
    font-size: 0;
    width: 0;
    height: 0;
    display: block;
  }

  &::after {
    content: '1';
    font-size: 0;
    width: 0;
    height: 0;
    display: block;
  }
}

.need-hover {
  position: relative;
  &.hover::before {
    content: ' ';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    background-color: rgba(0, 0, 0, .1);
  }
}
